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Try a road bike with 700c tires at 125psi, you have to top them off every time you ride. If I'm not mistaken the pressure loss is due to a combination of diffusion AND solubility of gas in the butyl rubber, in particular the CO2 fraction (assuming you are inflating with atmospheric air, or CO2...

Just to wrap this story up, Amperetime didn't give me a hard time at all about returning the batteries. After I shared the details they sent me UPS labels and issued a full refund after they received them. I didn't mention this thread, but I did share links to the videos. Kudos for Amperetime...

Too small for your application, but fwiw I bought a couple of the smaller top-of-pole mounts from Mars Solar. I have them planted on top of 2" RMC but no panels yet, will post pictures once I have those up. Looks like they are designed for 2" chain link posts, but easy to adapt...

The sheer weight of the drop pipe is hard to fathom, 1400' of 1-1/4" sch 40 plus #2/3 cable is in the 4500-5000 lb range. Pretty much like lowering a pickup truck down the hole. Better hold on tight while lowering it, lol. And jacking it out to replace a pump is going to be a sizeable...

lol, you gotta be talking about this guy

Makes sense but these batteries have never been discharged below 60% since I got them 1 month ago as they never left the bench. Also I just tested a second battery from the same batch, same results -- power supply set for 14.40V and reading 14.30V at the battery with 4A and dropping quickly...

Which top-of-pole mount did manage to get four of those Silfab 490's up with? Those panels aren't small or light, specs are pretty close to the Q-Cells 480 that I was considering. Like the EchoPod too, wish they were a little cheaper tho..

Okay here's another test, this time the battery is topped off and the Victron shunt shows it took at least 20Ah. BMS still drops out when you remove the charge, same as before. And here's a picture from the scope where you can see it drops out for about 1500mS. Something's going on with the...

Gotcha, yeah so I know they were under charge for quite a long time before this, but to capture it I'll hook up my smartshunt and top it off. Also this is one random battery out the 4S bank, so I could try a second one also. Or maybe recreate it with 2P ? That said, even if there was one low...

Happy New Year guys, thanks for the help. Just to drive it home I pulled out one of the batteries and shot a quick video this morning. Results are pretty much same behavior as the one you shared from @ddracing07. SOC is 90%+ and battery is 19C, so no issues with heating or low voltage...

Right? Without a storage scope it would be impossible to sort out.

Thanks for the youtube link, that sounds like exactly the problem I'm running into. Aye carumba, now I get to fight with Amperetime to get them to pay for return shipping ;) FWIW, heater is necessary in this application since this will be powering a Dankoff slow pump and stuff like that in a...

Sorry if this is a noob question, but I'm trying to understand if this is typical BMS behavior or not. When charging a 4S 48V bank of Amperetime 200AH batteries, if I remove the charge current suddenly there is a major voltage sag that lasts about 1.75 seconds and causes my inverter to fault...